I gotta tell you, I really regret not getting the MDP 750 with my MA-550
tower from UST. It's a significant bit of work to crank the thing up and
down on a daily basis. I'm seriously considering taking it down and
trailering it to Lincoln KS and having the motor drive retrofitted.
Something to ponder.
Betst luck,
Gil, W1RG
----- Original Message -----
From: "Jon M. Knodel" <jknodel@msn.com>
To: <towertalk@contesting.com>
Sent: Monday, October 16, 2006 12:59 AM
Subject: Re: [TowerTalk] Am I asking for trouble? - tower loading
> Thank you everyone for the replies. They have been very insightful. I
> was not planning on installing the motor with the tower - just the hand
> crank winch. My original idea was to install my 3 element SteppIR along
> with a 2 element 40m beam below it on a tall mast (15 or 20 feet). The
> tower I was thinking about is the UST TX472 which has a wind rating of
> 10.3 at 70 mph. These were my thoughts and the reason I raised the
> question.
>
> I am now thinking, because of everyone's good responses (and I really do
> appreciate the help), that I should not overload the tower at the 70 mph
> as I originally planned. I will probably step up to the stronger (and
> more expensive) HDX series and keep my antenna load within the 70 mph
> rating.
>
> But this raises another question. The city here has adopted a sustained
> wind speed rating of 90 mph and a gust rating of 105 mph. I have never
> seen winds of these speeds and the civil PE that I work with thinks that
> they are definitely overly conservative. But we do get some good winds in
> the winter here, being right on the coast - probably around 70 mph at
> times. So my question now is this: Since US Towers only specs their
> towers for 70 mph max, is there a way that I can calculate a rating at 90
> mph, using the same method that they used for getting the 70 mph rating?
> Does anyone know the UBC calculations used to achieve the EIA ratings? Do
> you think that US Towers would provide this information if asked for it?
>
> Thanks for all the help.
>
> ...Always wanting to learn more about antennas and towers... Jon, N7XW
> _______________________________________________
>
>
>
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